1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
#include "test.h"
long long Data;
long long Sync;
void *Thread1(void *x) {
Data++;
__atomic_store_n(&Sync, 1, __ATOMIC_RELEASE);
barrier_wait(&barrier);
barrier_wait(&barrier);
return NULL;
}
void *Thread2(void *x) {
barrier_wait(&barrier);
if (__atomic_load_n(&Sync, __ATOMIC_RELAXED) != 1)
exit(0);
// This store must terminate release sequence of the store in Thread1,
// thus tsan must detect race between Thread1 and main on Data.
__atomic_store_n(&Sync, 2, __ATOMIC_RELEASE);
barrier_wait(&barrier);
return NULL;
}
int main() {
barrier_init(&barrier, 3);
pthread_t t[2];
pthread_create(&t[0], NULL, Thread1, NULL);
pthread_create(&t[1], NULL, Thread2, NULL);
barrier_wait(&barrier);
barrier_wait(&barrier);
if (__atomic_load_n(&Sync, __ATOMIC_ACQUIRE) != 2)
exit(0);
if (Data != 1)
exit(0);
pthread_join(t[0], NULL);
pthread_join(t[1], NULL);
fprintf(stderr, "DONE\n");
return 0;
}
// CHECK: WARNING: ThreadSanitizer: data race
// CHECK: Read
// CHECK: #0 main
// CHECK: Previous write
// CHECK: #0 Thread1
// CHECK: Location is global 'Data'
// CHECK: DONE
|
